diff --git a/openwisp_monitoring/monitoring/migrations/0013_metric_configuration.py b/openwisp_monitoring/monitoring/migrations/0016_metric_configuration.py
similarity index 91%
rename from openwisp_monitoring/monitoring/migrations/0013_metric_configuration.py
rename to openwisp_monitoring/monitoring/migrations/0016_metric_configuration.py
index 1d858ff3e..021f975ad 100644
--- a/openwisp_monitoring/monitoring/migrations/0013_metric_configuration.py
+++ b/openwisp_monitoring/monitoring/migrations/0016_metric_configuration.py
@@ -7,7 +7,7 @@
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('monitoring', '0012_rename_graph_chart'),
+        ('monitoring', '0015_delete_models'),
     ]
 
     operations = [
diff --git a/openwisp_monitoring/monitoring/migrations/0014_merge_traffic_metrics_and_fill_metric_config.py b/openwisp_monitoring/monitoring/migrations/0017_merge_traffic_metrics_and_fill_metric_config.py
similarity index 97%
rename from openwisp_monitoring/monitoring/migrations/0014_merge_traffic_metrics_and_fill_metric_config.py
rename to openwisp_monitoring/monitoring/migrations/0017_merge_traffic_metrics_and_fill_metric_config.py
index 255b1ba57..750c6d0d1 100644
--- a/openwisp_monitoring/monitoring/migrations/0014_merge_traffic_metrics_and_fill_metric_config.py
+++ b/openwisp_monitoring/monitoring/migrations/0017_merge_traffic_metrics_and_fill_metric_config.py
@@ -51,7 +51,7 @@ def fill_configuration(apps, schema_editor):
 class Migration(migrations.Migration):
 
     dependencies = [
-        ('monitoring', '0013_metric_configuration'),
+        ('monitoring', '0016_metric_configuration'),
     ]
 
     operations = [
diff --git a/tests/openwisp2/sample_monitoring/migrations/0001_initial.py b/tests/openwisp2/sample_monitoring/migrations/0001_initial.py
index ef31cecf1..f575408c7 100644
--- a/tests/openwisp2/sample_monitoring/migrations/0001_initial.py
+++ b/tests/openwisp2/sample_monitoring/migrations/0001_initial.py
@@ -9,6 +9,7 @@
 import swapper
 
 from openwisp_monitoring.monitoring.charts import CHART_CONFIGURATION_CHOICES
+from openwisp_monitoring.monitoring.metrics import get_metric_configuration_choices
 
 
 class Migration(migrations.Migration):
@@ -49,7 +50,14 @@ class Migration(migrations.Migration):
                     ),
                 ),
                 ('name', models.CharField(max_length=64)),
-                ('description', models.TextField(blank=True)),
+                (
+                    'configuration',
+                    models.CharField(
+                        choices=get_metric_configuration_choices(),
+                        max_length=16,
+                        null=True,
+                    ),
+                ),
                 (
                     'key',
                     models.SlugField(
diff --git a/tests/openwisp2/sample_monitoring/migrations/0006_metric_configuration.py b/tests/openwisp2/sample_monitoring/migrations/0006_metric_configuration.py
deleted file mode 100644
index 3d2d8030f..000000000
--- a/tests/openwisp2/sample_monitoring/migrations/0006_metric_configuration.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# Generated by Django 3.0.3 on 2020-05-29 02:12
-
-from django.db import migrations, models
-from openwisp_monitoring.monitoring.metrics import get_metric_configuration_choices
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('sample_monitoring', '0005_rename_graph_chart'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='metric',
-            name='configuration',
-            field=models.CharField(
-                choices=get_metric_configuration_choices(), max_length=16, null=True,
-            ),
-        ),
-        migrations.RemoveField(model_name='metric', name='description'),
-    ]